Covering for tank



FIG. 1 is a perspective view of a covering for tank, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing of a tank and lettering on the tank cover is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a “covering for tank,” as shown and described. 